I have every single periodical, poster, mail-ins that had a feature or article from the original Tron. The stack is about 2 feet high.
I have all the Tomy toys. Laserdiscs, soundtracks in all formats.
Some limited edition Kubrick / Medicom figures as well from Japan.
Have restored about 10 trons and two DOTS in my years of collecting have one machine left.
However, I won't buy anything from the new Tr2n legacy (however I did join Flynnlives late in the game and played Tron Killer App for the PC. It's just too expensive to be collecting these things.